International Day of Light 16 Mayさんのイラストまとめ
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Celebrate the International Day of Light (16 May), an annual observance of #UNESCO. 2025 theme * Light, Innovation, Society * #lightday2025
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Looking for ideas to organise educational activities related to light? Check the e-book 100 educational activities about Light and Photonics developed by @unawe during #IYL2015 https://t.co/sIDdCKTx1b @unawe #IDL2019
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